86 COMMERCIAL ROSE CULTURE 



There are a number of poisons which may be used for killing 

 insects, but their use is not often necessary and therefore is not 

 recommended except in extreme cases. Mention has been made 

 of Paris green and arsenate of lead in another chapter. 



SULPHUR 



Is too well known and commonly used to require much de- 

 scription. It is insoluble in water, but fusible with heat. When 

 made into a paste and painted on steam pipes it is melted at 

 once if the pipes are full of live steam. Large deposits of crude 

 sulphur are found in certain parts of the world ; after different 

 processes of manufacture, which include distilling and subli- 

 mating, a fine yellow powder like flour is the result, which is 

 commonly called Flowers of Sulphur. This should never be 

 evaporated over a lamp or an oil stove, or over, a fire of any 

 description as, if it burns, a gas will be created which will take 

 all the foliage off the plants. Place the quantity required in a 

 small pail, add water to make a paste, and crush the lumps with 

 the hand. Then add enough water to make a paint, which is 

 easily applied to the steam pipes with a large paint brush. One 

 pipe painted in a narrow house is enough, two or three will be 

 required in the wider houses. A lump of lime may be added, 

 when mixing, to help it stick on the pipes. Some growers make 

 a paste of pure linseed oil and sulphur and paint this on the 

 pipes, but this is unsightly and creates a bad odor; however, it 

 saves sulphur and is lasting. Sulphur continuously applied to 

 an iron pipe will eat it away in time sufficiently so as to impair 

 its lasting qualities. It is best to always paint the same pipe 

 and then, if damage is done, that particular pipe may in time 

 be replaced. Dry sulphur may be dusted on the foliage with 

 the bellows and allowed to stay on in the hot sun for a few days 

 before being washed off. 



